who said its was an excuse? the guys on the video are the exception, 'cause that was pretty easy, and i asure you it could be even easier with a high travel full suspension bike -that's what most guys here rides(including me)-, you're putting in the same bag to every xc racer, who are better going uphill than downhill. cheers.
well, if you can do a, at least, 15km ascend non stop you have all the authority to say that words. maybe you dont know, but xc is more of a cardio, muscular power and stamina sport than going downhill on a very short track. im not saying that downhiller, enduroers, etc dont have a proper physical condition but you're comparing a 2000m sprinter with a 42km marathonist, both are athletes but they're completely different